<p>You want to go to a city where everybody always is truthful.</p>

18.

You want to go to a city where everybody always is truthful.

You want to go to a city where everybody always says the truth. On your way there, you reach a crossroad. On one side is the city where everyone says the truth; on the other is a city where everyone lies. There is a man at the crossroad that comes from one of the cities. You do not know from which city the man comes, and you can only ask him one question to find out where the city of truth is. What do you ask him?

Submitted by tartle · Added 17 January 2013 · Updated 5 July 2026

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Solution:

You can ask the man, 'Which city do you come from?' If he tells the truth, he will point to the city of Truth. If he lies, he will also point to the city of Truth. Therefore, you should go towards the city he indicates.

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